72219578 has 4 divisors (see below), whose sum is σ = 108329370. Its totient is φ = 36109788.

The previous prime is 72219577. The next prime is 72219593. The reversal of 72219578 is 87591227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87591227 = 1181 ⋅74167.

It can be written as a sum of positive squares in only one way, i.e., 63792169 + 8427409 = 7987^2 + 2903^2 .

It is not an unprimeable number, because it can be changed into a prime (72219571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18054893 + ... + 18054896.

Almost surely, 2^72219578 is an apocalyptic number.

72219578 is a deficient number, since it is larger than the sum of its proper divisors (36109792).

72219578 is a wasteful number, since it uses less digits than its factorization.

72219578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36109791.

The product of its digits is 70560, while the sum is 41.

The square root of 72219578 is about 8498.2102821712. The cubic root of 72219578 is about 416.4392434292.

The spelling of 72219578 in words is "seventy-two million, two hundred nineteen thousand, five hundred seventy-eight".